Hi there,
Yes, 4.1(3) would be the minimum required version
DMA for Cisco Unified Communications Manager Release 4.x
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/compat/ccmcompmatr.html#wp57424
DMA release Notes
http://www.cisco.com/en/US/products/sw/voicesw/ps556/prod_release_notes_list.html
Data Migration Assistant (DMA) Release 7.1(3) collects application data from Unified CM Releases 4.1(3), 4.2(3), and 4.3(2) system for upgrade to Cisco Unified Communications Manager Release 7.1(3). DMA exports data in the current Window based system (with SQL server database) that later gets imported to the appliance-based system (with Informix database).
Cheers!
Rob